How to hide joint axis in Rviz

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How do you hide the joint axis in Rviz, or at least make them translucent or smaller so they don't hide your model?

I have a model consisting of a box with a single thin "leg", but the joint axis indicators for the leg are so big, they're obscuring the leg.

<?xml version="1.0"?>
<robot name="myrobot"
    xmlns:xacro="http://www.ros.org/wiki/xacro">

    <!-- Included URDF/XACRO Files -->
    <xacro:include filename="$(find myrobot_description)/urdf/materials.urdf.xacro" />

    <!-- width in meters -->
    <property name="torso_x_size" value="0.1" />

    <!-- length in meters -->
    <property name="torso_y_size" value="0.205" />

    <!-- height in meters -->
    <property name="torso_z_size" value="0.03" />

    <!-- torso mass (not including legs) in kg -->
    <property name="torso_mass" value="0.920" />

    <!-- mass of a single upper leg piece in kg -->
    <property name="upper_leg_mass" value="0.010" />

    <link name="base_link">
        <visual>
            <geometry>
                <box size="${torso_x_size} ${torso_y_size} ${torso_z_size}" />
            </geometry>
            <material name="red"/>
        </visual>
        <xacro:default_inertial mass="${torso_mass}"/>
    </link>
    <xacro:macro name="leg" params="name reflect_x reflect_y">
        <link name="${name}">
            <visual>
                <geometry>
                    <box size="0.003 0.04 0.005" />
                </geometry>
                <origin xyz="0 0.04 0" rpy="0 0 0"/>
                <material name="blue" />
            </visual>
            <collision>
                <geometry>
                    <box size="0.003 0.04 0.005" />
                </geometry>
                <origin xyz="0 0.04 0" rpy="0 0 0"/>
            </collision>
            <xacro:default_inertial mass="${upper_leg_mass}"/>
        </link>
        <joint name="torso_to_${name}" type="fixed">
            <parent link="base_link"/>
            <child link="${name}"/>
            <origin xyz="${torso_x_size/2*reflect_x} ${torso_y_size/2*reflect_y} 0" />
        </joint>
    </xacro:macro>
    <xacro:leg name="front_right_leg" reflect_x="1" reflect_y="1" />
</robot>

The default leg position puts it right where the green cylinder is, which, as you can see, completely obscures it.